Worlds of David Darling
Encyclopedia of Science
Home > Encyclopedia of Science

a priori

The terms a priori and a posteriori are descriptive of knowledge or reasoning, reflecting whether or not it is the result of our experience of the real world. Alleged knowledge attained solely through reasoning from arbitrary principles is a priori (Latin: from earlier things); that gained empirically, from observation or experience, is a posteriori (Latin: from later things). This modern usage of the terms derives from the philosopher Kant.

Related categories

   • LOGIC